Caffeine, a new Google search index that's continually updating everything it finds rather than pushing new pages through a process, has gone live across Google's servers. What does that mean for your searching? Likely more relevant, up-to-date results that are "50 percent faster," according to Google. That jibes with what our readers and editors found back when Caffeine was still an opt-in test. Hit the link for Google's explanation of what Caffeine does, and tell us what you think of the released-but-continually-updating product in the comments. [Official Google Blog]